Patents by Inventor Richard Thomas Entwistle

Richard Thomas Entwistle has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7815162
    Abstract: The invention concerns a valve arrangement (1) with a housing (2), an inlet connection (3) and an outlet connection (4), which are connected with each other via a flow path, in which is located a dosing device (5), which has a valve seat (7) and a valve element (6) interacting with the valve seat (7), the valve element (6) being loaded in the direction of the valve seat (7) by a resetting device (8) and being acted upon on the side facing the valve seat (7) by a pressure in a first pressure chamber (9), said pressure corresponding to the pressure in the inlet connection (3), when the dosing device (5) is dosed, and on the side facing away from the valve seat (7) by the pressure in a second pressure chamber (11), which is connected with the outlet connection (4) via a channel arrangement (14), in which is located at least one auxiliary valve (15), and with the first pressure chamber (9) via a throttle (13). It is endeavoured to reliably ensure that the closing device (5) opens.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: October 19, 2010
    Assignee: Danfoss A/S
    Inventors: Richard Thomas Entwistle, Erik Haugaard
  • Patent number: 7770687
    Abstract: The invention concerns a hydraulic steering with a steering motor arrangement having at least one steering motor, and with at least two steering circuits, each having a steering valve that interrupts a path from a pressure supply to the steering motor arrangement in the neutral position and releases a path from the pressure supply to the steering motor arrangement on a movement out of the neutral position. It is endeavored to simplify the embodiment of such a steering. For this purpose, the steering valve (5a, 5b) has two end positions, one on each side of the neutral position, in which positions a path from the pressure supply (15, 21) to the steering motor arrangement (2) is interrupted.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: August 10, 2010
    Assignee: Sauer-Danfoss Aps
    Inventors: Richard Thomas Entwistle, Carl Christian Dixen, Steve Crow
  • Publication number: 20070251755
    Abstract: The invention concerns a hydraulic steering with a steering motor arrangement having at least one steering motor, and with at least two steering circuits, each having a steering valve that interrupts a path from a pressure supply to the steering motor arrangement in the neutral position and releases a path from the pressure supply to the steering motor arrangement on a movement out of the neutral position. It is endeavoured to simplify the embodiment of such a steering. For this purpose, the steering valve (5a, 5b) has two end positions, one on each side of the neutral position, in which positions a path from the pressure supply (15, 21) to the steering motor arrangement (2) is interrupted.
    Type: Application
    Filed: April 26, 2007
    Publication date: November 1, 2007
    Applicant: Sauer-Danfoss ApS
    Inventors: Richard Thomas Entwistle, Carl Christian Dixen, Steve Crow
  • Patent number: 6708725
    Abstract: The invention concerns a valve, particularly a solenoid valve, with an inlet connection and an outlet connection, having between them a shut-off device with a valve seat and a closure member. In such a valve, it is endeavoured to obtain a small output with a simple design. For this purpose, the closure member has a closing element and a tappet separate from the closing element, the closing element being held in a guiding arrangement.
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: March 23, 2004
    Assignee: Danfoss A/S
    Inventors: Richard Thomas Entwistle, Hardy Jepsen
  • Patent number: 6666231
    Abstract: The invention relates to a solenoid valve with an inlet connection and an outlet connection, having between them a blocking device with a valve seat, a closure member and an armature, which influences a position of the closure member in relation to the valve seat. It is endeavoured to make a valve with a simple embodiment and little wear. For this purpose, it is ensured that the armature is arranged in a housing, dividing it into two chambers, and that the armature has a movement stroke with several sections, one first section being in the form of an idle stroke, during which a connection between the two chambers is open and the position of the closure member in relation to the valve seat does not change, and a second section being in the form of an effective stroke, during which the connection between the two chambers is closed and the armature causes or permits a movement of the closure member.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: December 23, 2003
    Assignee: Danfoss A/S
    Inventor: Richard Thomas Entwistle
  • Publication number: 20020079006
    Abstract: The invention concerns a valve, particularly a solenoid valve, with an inlet connection and an outlet connection, having between them a shut-off device with a valve seat and a closure member.
    Type: Application
    Filed: December 20, 2001
    Publication date: June 27, 2002
    Inventors: Richard Thomas Entwistle, Hardy Jepsen
  • Publication number: 20020079007
    Abstract: The invention relates to a solenoid valve with an inlet connection and an outlet connection, having between them a blocking device with a valve seat, a closure member and an armature, which influences a position of the closure member in relation to the valve seat.
    Type: Application
    Filed: December 19, 2001
    Publication date: June 27, 2002
    Inventor: Richard Thomas Entwistle
  • Patent number: 6158993
    Abstract: The invention concerns a hydraulic motor (1) having at least one gearwheel set section (2), a supply section (3) and a front section (4) on which an output arrangement (15) can be fixed, the sections (2 to 4) being connected with each other in the axial direction by fixing bolts (11).It is desired to simplify the production and the service during operation for such a motor.For this purpose several bores (17) are provided, which penetrate the motor (1,) from one axial end (21) to the other, in which connection bolts (6) are arranged, which are provided with an engagement area (18) on the side of the front section (4).
    Type: Grant
    Filed: September 25, 1998
    Date of Patent: December 12, 2000
    Assignee: Danfoss Fluid Power A/S
    Inventors: Welm Friedrichsen, Tom Tychsen, Richard Thomas Entwistle, Anders Bladt, Ib Damgaard, B.o slashed.rge Duus